Hub, connecting structure of hub and spokes and production process

Abstract

The invention discloses a hub which comprises a shell made of a carbon fiber material, a metal cover made of a metal material and an axis rotating assembly, and the shell and the metal cover are integrally formed in an embedded mode. The invention further discloses a connecting structure of the hub and the spokes, the connecting structure comprises the integrated spoke assemblies and the hub, and the integrated spoke assemblies are arranged at the two ends of the aluminum carbon hub in a sleeving mode. Secondly, the invention also discloses another form of connecting structure of the hub and the spokes for the hub, the mounting part of at least one end of the shell is a plurality of spoke mounting holes formed in the circumferential direction of the shell, and the spokes penetrate outwards from the interior of the cavity of the shell and are clamped on the inner sides of the spoke mounting holes. In addition, the invention further discloses a production process of the hub so as to produce the hub. The weight of the hub can be reduced on the basis that the strength of the hub is guaranteed, the connecting strength of the spokes is improved, and rapid assembly is achieved.

Description

Technical Field

[0001] This invention relates to the field of bicycle component manufacturing and processing technology, specifically to a hub and its connection structure with spokes, as well as the manufacturing process. Background Technology

[0002] The wheel is a crucial component of a bicycle system, primarily consisting of the rim, hub, spokes, and spoke nuts. The combination of the rim, hub, and spokes, as well as the spoke weaving method, collectively influences the bicycle's performance. The hub, in particular, is the core of the bicycle's drivetrain, transmitting driving force to the wheel and enabling its rotation.

[0003] Most existing hubs are bearing hubs, mainly composed of a shell and bearings. The shell protects the bearings installed inside and also secures the bearings to the wheel, supporting the wheel and providing smooth movement. Currently, hubs are mostly made of aluminum alloy shells or use carbon fiber materials in parts of the aluminum alloy shell to reduce weight. However, existing spokes are mostly single, short spokes. Connecting the hub to the rim requires a large number of spokes, and the hub is subjected to tension from the spokes in multiple directions, making it prone to damage after prolonged use and difficult to replace. Summary of the Invention

[0004] The purpose of this invention is to provide a hub and its connection structure with the spokes, as well as a manufacturing process, to reduce the hub weight while ensuring hub strength, improve spoke connection strength, and achieve rapid assembly. To achieve the above objectives, this invention adopts the following technical solution: The present invention discloses a hub, comprising: a housing, two sets of metal caps, and a shaft rotation assembly.

[0005] The shell is made of carbon fiber material, and mounting portions for mounting spokes are provided on the outer sides of both ends of the shell.

[0006] The metal cover is made of metal material. Two sets of metal covers are located at both ends of the shell and are integrally formed with the shell. The outer wall of the metal cover is provided with a groove, and the carbon fiber material on the inner side of both ends of the shell covers the groove.

[0007] The axial rotation assembly is rotatably mounted inside the housing and metal cover.

[0008] Preferably, the groove is composed of several annular grooves and multiple straight grooves, the annular grooves being arranged circumferentially along the metal cover and the straight grooves being arranged axially along the metal cover.

[0009] Furthermore, the shaft rotation assembly includes a shaft, bearings, and a limiting member. Both ends of the shaft are rotatably mounted within the housing and the metal cover via the bearings. The limiting member is inserted into the cavity between the metal cover and the shaft to limit the shaft rotation assembly within the housing and the metal cover.

[0010] Furthermore, the metal cover includes a first metal cover and a second metal cover, which are respectively disposed at both ends of the housing. The other end of the second metal cover connected to the housing extends outward to form a ring-shaped extension, the outer wall of which is provided with ratchet teeth and the inner wall with threads.

[0011] Furthermore, the present invention also discloses a connection structure between a hub and spokes, comprising: a spoke assembly and the aforementioned hub.

[0012] The mounting portions at both ends of the hub shell are raised flanges.

[0013] The spoke assembly includes a connecting ring and a plurality of spokes circumferentially connected to the connecting ring. The connecting ring has a mounting groove at its center and is fitted and fixed to the flanges at both ends of the hub housing.

[0014] Preferably, the mounting groove at the center of the connecting ring is non-circular, and the flange is provided with a non-circular boss that matches the mounting groove.

[0015] Preferably, the spokes are divided into several spoke groups on the circumferential sidewall of the connecting ring. Each spoke group includes two spokes stacked vertically, with an included angle α of 115° to 125° between the two stacked spokes, and each spoke is tangent to the circumference of the connecting ring. The spokes are inclined inward, with an inward inclination angle β of 3° to 10°.

[0016] Preferably, the spokes and connecting ring are made of carbon fiber material, and the spokes and connecting ring are integrally molded.

[0017] Furthermore, the present invention also discloses a connection structure between a hub and spokes, comprising: spokes and a hub as described above.

[0018] The housing has a mounting portion at at least one end consisting of a plurality of first spoke mounting holes arranged circumferentially around the housing. A third metal cover is disposed within the mounting portion of the housing, and the third metal cover has fourth spoke mounting holes circumferentially corresponding to the first spoke mounting holes. The spoke includes a spoke rod and a snap-fit ​​end located at the end of the spoke rod. The spoke rod passes sequentially outward from the cavity inside the housing through the fourth spoke mounting hole and the first spoke mounting hole, such that the snap-fit ​​end engages with the inner side of the fourth spoke mounting hole.

[0019] Preferably, the diameter of one end of the mounting portion of the housing is larger than the diameter of the middle portion; the first spoke mounting hole and the fourth spoke mounting hole are in the shape of a circular main hole and a straight hole extending from one side of the circular main hole, and the width of the straight hole is smaller than the diameter of the circular main hole.

[0020] Furthermore, the housing has the mounting portion at only one end, and the other end extends outward to form several blades. Each blade has a second spoke mounting hole and a third spoke mounting hole. The spokes include two sets: the first set of spokes passes through the second spoke mounting hole and is installed clockwise; the second set of spokes passes through the third spoke mounting hole and is installed counterclockwise, so that the first set of spokes and the second set of spokes form a cross-woven structure.

[0021] Furthermore, the present invention also discloses a manufacturing process for a hub, wherein the hub is produced by the following method: S1. Form two sets of metal cover blanks, one end of which has the groove on its outer wall; form an annular silicone sleeve that fits into the inner cavity of the hub shell.

[0022] S2. Install two sets of metal cap blanks at both ends of the silicone sleeve, and wrap multiple layers of carbon fiber yarn around the silicone sleeve and the metal cap, so that part of the carbon fiber yarn covers the groove of the metal cap to form a carbon fiber covered part.

[0023] S3. Place the carbon fiber coated part obtained in step S2 into the drum shell preparation mold, and apply pressure and heat to solidify the carbon fiber yarn.

[0024] S4. Open the mold, remove the carbon fiber covering, and remove the silicone sleeve inside.

[0025] S5. Machining the metal cap blanks at both ends to form the corresponding shape and size, thus obtaining the required metal cap.

[0026] S6. Assemble the pivot rotation assembly to form the hub.

[0027] In step S1, the expansion coefficient of the silicone sleeve is 1.2~1.3; in step S3, after the carbon fiber covering is placed in the hub shell preparation mold, the mold closing pressure set in the hub shell preparation mold is 55t~65t, the temperature is 155℃~165℃, and the curing time is 50~80min.

[0028] Furthermore, the hub shell manufacturing mold includes: a base, a cover, and a mold core assembly, a slider assembly, and a mold core assembly installed in the cavity formed by the base and the cover. The mold core assembly includes an upper mold core and a lower mold core, the inner walls of which are provided with mold core cavities adapted to the shape of the outer wall of the hub shell; the mold core assembly is used to fit the carbon fiber covering and is located in the middle of the cavity; the slider assembly is formed by a plurality of sliders, the inner side of which is provided with slider cavities adapted to the shape of the outer wall of the hub shell; the slider assembly is disposed between the upper mold core and the lower mold core and surrounds the periphery of the carbon fiber covering.

[0029] The mold core assembly includes a mold core and a mold core base. The base has a multi-layered, upward-protruding boss at its center. The mold core base is hollowed out in the middle. The mold core assembly is fixed by fitting the mold core base onto the boss. Both the upper and lower mold cores are composed of several mold core blocks, which correspond to the slider.

[0030] After adopting the above technical solution, the present invention has the following effects: 1. The present invention integrates the shell and the metal cover into a single molding process, and sets a groove at the end of the metal cover. During the integral molding process, carbon fiber yarn is wrapped around the groove, which can reduce the weight of the hub while ensuring the strength of the hub.

[0031] 2. This invention improves the spoke connection strength and enables rapid assembly by installing integrated spoke assemblies at both ends of the aluminum-carbon hub.

[0032] 3. This invention utilizes a silicone sleeve and a hub shell preparation mold to cure and mold the carbon fiber shell, and embeds the metal cap in an integral mold, which can improve the production efficiency of the hub shell and reduce production costs. Attached Figure Description

[0033] Figure 1 This is a three-dimensional structural diagram of the flower drum in the first embodiment of the present invention.

[0034] Figure 2 This is an exploded view of the hub in the first embodiment of the present invention.

[0035] Figure 3 This is a three-dimensional structural diagram of the first metal cover and the second metal cover in the first embodiment of the present invention.

[0036] Figure 4 This is a top view of the flower drum in the first embodiment of the present invention.

[0037] Figure 5 for Figure 4 AA section view.

[0038] Figure 6 This is a three-dimensional structural diagram of the connection between the hub and the spoke assembly in the first embodiment of the present invention.

[0039] Figure 7 This is a front view of the spoke assembly connected to one end of the hub in the first embodiment of the present invention.

[0040] Figure 8 for Figure 7 BB-direction cross-sectional view.

[0041] Figure 9 for Figure 8 Enlarged view of point C.

[0042] Figure 10 This is a three-dimensional structural diagram of the flower drum in the second embodiment of the present invention.

[0043] Figure 11 This is a three-dimensional structural diagram of the spoke end in the second embodiment of the present invention.

[0044] Figure 12 This is a three-dimensional structural diagram of the spokes extending from the inside of the shell outwards in the second embodiment of the present invention.

[0045] Figure 13 This is a three-dimensional structural diagram of the second embodiment of the present invention, showing the spokes being inserted into the second spoke mounting hole or the third spoke mounting hole respectively.

[0046] Figure 14 This is a three-dimensional structural diagram of the mold for preparing the hub shell of the present invention.

[0047] Figure 15 This is an exploded view of the mold used to prepare the hub shell of the present invention.

[0048] Figure 16 This is an exploded view of the hub shell and mold core assembly of the present invention.

[0049] Figure 17 This is a top view of the mold used to prepare the hub shell of the present invention.

[0050] Figure 18 for Figure 17 DD section view.

[0051] Main component symbols: 1: Hub, 11: Housing, 111: Flange, 112: Boss, 113: First spoke mounting hole, 114: Blade, 115: Second spoke mounting hole, 116: Third spoke mounting hole, 12: Axle, 13: First metal cap, 14: Second metal cap, 141: Extension, 142: Racket, 143: Thread, 15: Limiting element, 16: Bearing, 17: Groove, 18: Third metal cap, 181: Fourth spoke mounting hole, 2: Spoke assembly, 21: Connecting ring, 211: Mounting groove, 22: Spoke, 221: Spoke rod, 222: Snap-fit ​​end, 3: Hub housing preparation mold, 31: Base, 311: Boss, 32: Cap, 33: Mold core, 34: Mold core seat, 35: Upper mold core, 36: Lower mold core, 37: Slider, 4: Silicone sleeve. Detailed Implementation

[0052] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0053] Example 1 like Figure 1 and Figure 2 As shown, the present invention discloses a hub, comprising: a housing 11, two sets of metal covers and a shaft rotation assembly.

[0054] The housing 11 is made of carbon fiber material, and mounting parts for mounting spokes are provided on the outer sides of both ends of the housing 11.

[0055] The metal cover is made of metal material. Two sets of metal covers are located at both ends of the housing 11 and are integrally formed with the housing 11. The outer wall of the metal cover is provided with a groove 17. The carbon fiber material on the inner side of both ends of the housing 11 is covered on the groove 17, which facilitates the integral forming of the housing 11 and the metal cover and enables the carbon fiber material to wrap the connection between the housing 11 and the metal cover more tightly during the forming process, thereby enhancing the connection strength between the housing 11 and the metal cover.

[0056] Among them, such as Figure 5 As shown, the groove 17 is composed of several annular grooves and multiple straight grooves. The annular grooves are arranged along the circumference of the metal cover, and the straight grooves are arranged along the axial direction of the metal cover.

[0057] The axial rotation assembly is rotatably mounted inside the housing 11 and the metal cover.

[0058] Combination Figure 3 and Figure 4As shown, in this embodiment, the shaft rotation assembly includes a shaft 12, bearings 16, and a limiting member 15. The two ends of the shaft 12 are rotatably mounted in the housing 11 and the metal cover via the bearings 16. The limiting member 15 is inserted into the cavity between the metal cover and the shaft 12 to limit the shaft rotation assembly within the housing 11 and the metal cover.

[0059] Secondly, in this embodiment, the metal cover includes a first metal cover 13 and a second metal cover 14, which are respectively disposed at both ends of the housing 11. The other end of the second metal cover 14 connected to the housing 11 extends outward to form a ring extension 141. The outer wall of the extension 141 is provided with ratchet teeth 142, and the inner wall is provided with threads 143.

[0060] like Figure 6 As shown, the present invention also discloses a connection structure between a hub and spokes, comprising: a spoke assembly 2 and a hub 1 as described above.

[0061] Combination Figures 7 to 9 As shown, the mounting portions at both ends of the housing 11 in the hub 1 are protruding flanges 111.

[0062] The spoke assembly 2 includes a connecting ring 21 and a plurality of spokes 22 circumferentially connected to the connecting ring 21. The connecting ring 21 has a mounting groove 211 at its center and is fitted and fixed to the flanges 111 at both ends of the hub 1 housing 11.

[0063] The mounting groove 211 at the center of the connecting ring is non-circular, and the flange 111 is provided with a non-circular boss 112 that matches the mounting groove 211.

[0064] In this embodiment, the spokes 22 are divided into several spoke groups on the circumferential sidewall of the connecting ring 21. Each spoke group includes two spokes 22 stacked vertically, with an included angle α between the two stacked spokes 22 of 115° to 125°. Each spoke 22 is tangent to the circumference of the connecting ring 21. Simultaneously, the spokes 22 are inclined inward at an angle β of 3° to 10°.

[0065] Furthermore, in this embodiment, the spokes 22 and the connecting ring 21 are made of carbon fiber material, and the spokes 22 and the connecting ring 21 are integrally formed. Example 2 The difference between this embodiment and Embodiment 1 is that the specific structure of the mounting part for mounting spokes provided on the outer sides of both ends of the hub 1 is different, and the present invention also discloses a corresponding connection structure between the hub and the spokes.

[0066] like Figure 10 and Figure 11As shown, in this embodiment, the mounting portion at at least one end of the hub 1 housing 11 is a plurality of first spoke mounting holes 113 provided in the circumference of the housing 11, and the metal cover provided in the mounting portion of the housing 11 is a third metal cover 18, and the third metal cover 18 is provided with fourth spoke mounting holes 181 in the circumference corresponding to the first spoke mounting holes 113.

[0067] The spoke 22 includes a spoke rod 221 and a snap-fit ​​end 222 located at the end of the spoke rod 221. The spoke rod 221 passes sequentially outward from the cavity inside the housing 11 through the fourth spoke mounting hole 181 and the first spoke mounting hole 113, so that the snap-fit ​​end 222 snaps into the inside of the fourth spoke mounting hole 181. Figure 12 As shown.

[0068] The diameter of one end of the mounting portion of the housing is larger than the diameter of the middle portion; the first spoke mounting hole and the fourth spoke mounting hole are in the shape of a circular main hole and a straight hole extending from one side of the circular main hole, and the width of the straight hole is smaller than the diameter of the circular main hole.

[0069] Combination Figure 13 As shown, the housing 11 has a mounting part at only one end, and the other end of the housing 11 extends outward to form a number of blades 114. Each blade 114 is provided with a second spoke mounting hole 115 and a third spoke mounting hole 116.

[0070] The spokes 22 include two sets. The first set of spokes 22 passes through the second spoke mounting hole 115 and is installed by rotating clockwise. The second set of spokes 22 passes through the third spoke mounting hole 116 and is installed by rotating counterclockwise, so that the two sets of spokes 22 form a cross-woven structure.

[0071] Furthermore, this invention also discloses a manufacturing process for a hub, which produces the aforementioned hub through the following method: S1. Form two sets of metal cap blanks, with a groove on the outer wall of one end of the metal cap blank; form an annular silicone sleeve, which is adapted to the inner cavity of the hub shell.

[0072] S2. Install two sets of metal cap blanks at both ends of the silicone sleeve, and wrap multiple layers of carbon fiber yarn around the silicone sleeve and the metal cap, so that some of the carbon fiber yarn covers the groove of the metal cap to form a carbon fiber covered part.

[0073] S3. Place the carbon fiber coated part obtained in step S2 into the drum shell preparation mold, and apply pressure and heat to solidify the carbon fiber yarn.

[0074] S4. Open the mold, remove the carbon fiber covering, and remove the silicone sleeve inside.

[0075] S5. Machining the metal cap blanks at both ends to form the corresponding shape and size, thus obtaining the required metal cap.

[0076] S6. Assemble the pivot rotation assembly to form the hub.

[0077] In step S1, the expansion coefficient of the silicone sleeve is 1.2~1.3; in step S3, after the carbon fiber covering is placed in the hub shell preparation mold, the mold closing pressure set in the hub shell preparation mold is 55t~65t, the temperature is 155℃~165℃, and the curing time is 50~80min.

[0078] like Figures 14 to 16 As shown, the hub shell preparation mold 3 includes: a base 31, a cover 32, and a mold core assembly, a slider assembly, and a mold core assembly installed in the cavity formed by the base 31 and the cover 32.

[0079] Combination Figures 17 to 18 As shown, in this embodiment, the mold core assembly includes an upper mold core 35 and a lower mold core 36. The inner walls of the upper mold core 35 and the lower mold core 36 are provided with mold core cavities that are adapted to the shape of the outer wall of the shell 11 of the hub 1. The mold core assembly is used to fit the carbon fiber covering and is located in the middle of the cavity. The slider assembly is formed by a plurality of sliders 37, and the inner side of the slider 37 is provided with a slider cavity that is adapted to the shape of the outer wall of the shell 11 of the hub 1. The slider assembly is disposed between the upper mold core 35 and the lower mold core 36 and surrounds the periphery of the carbon fiber covering. At the same time, both the upper mold core 35 and the lower mold core 36 are assembled from a plurality of mold core blocks, and the mold core blocks correspond to the sliders 37.

[0080] The mold core assembly includes a mold core 33 and a mold core seat 34. The base 31 has a multi-layered, upward-protruding boss 311 at its center. The mold core seat 34 has a hollow center. The mold core assembly is fixed by fitting the mold core seat 34 onto the boss 311. During operation, the carbon fiber cladding is first fitted onto the mold core 33, then the mold core seat 34 is installed and fixed by fitting the mold core seat 34 onto the boss 311.

[0081] The above description is merely a preferred embodiment of the present invention. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the protection scope of the present invention.

Claims

1. A flower drum, characterized in that, include: The housing, two sets of metal covers, and the rotating shaft assembly; The shell is made of carbon fiber material, and mounting portions for mounting spokes are provided on the outer sides of both ends of the shell; The metal cover is made of metal material. Two sets of metal covers are located at both ends of the shell and are integrally formed with the shell. The outer wall of the metal cover is provided with a groove, and the carbon fiber material on the inner side of both ends of the shell covers the groove. The axial rotation assembly is rotatably mounted inside the housing and metal cover.

2. A flower drum as described in claim 1, characterized in that: The groove is composed of several annular grooves and multiple straight grooves. The annular grooves are arranged circumferentially along the metal cover, and the straight grooves are arranged axially along the metal cover.

3. A flower drum as described in claim 1, characterized in that: The shaft rotation assembly includes: a shaft, bearings, and a limiting member. The two ends of the shaft are rotatably mounted in the housing and the metal cover via the bearings. The limiting member is inserted into the cavity between the metal cover and the shaft to limit the shaft rotation assembly within the housing and the metal cover.

4. A flower drum as described in claim 1, characterized in that: The metal cover includes: a first metal cover and a second metal cover, wherein the first metal cover and the second metal cover are respectively disposed at both ends of the housing; The other end of the second metal cap that is connected to the housing extends outward to form a ring extension. The outer wall of the extension is provided with ratchet teeth, and the inner wall is provided with threads.

5. A connection structure between a hub and spokes, characterized in that, include: Spoke assembly and a hub as claimed in any one of claims 1-4; The mounting portions at both ends of the hub shell are protruding flanges; The spoke assembly includes a connecting ring and a plurality of spokes circumferentially connected to the connecting ring. The connecting ring has a mounting groove at its center and is fitted and fixed to the flanges at both ends of the hub housing.

6. The connection structure between the hub and spokes as described in claim 5, characterized in that: The mounting groove of the connecting ring is non-circular, and the flange is provided with a non-circular boss that matches the mounting groove.

7. The connection structure between the hub and spokes as described in claim 5, characterized in that: The spokes are divided into several spoke groups on the circumferential sidewall of the connecting ring. Each spoke group includes two spokes stacked one on top of the other, with an included angle α of 115° to 125° between the two stacked spokes. Each spoke is tangent to the circumference of the connecting ring. The spokes are inclined inward with an inward inclination angle β of 3° to 10°.

8. The hub and spoke connection structure as described in any one of claims 4-7, characterized in that: The spokes and connecting rings are made of carbon fiber material and are integrally molded.

9. A connection structure between a hub and spokes, characterized in that, include: Spokes and a hub as described in any one of claims 1-4; The mounting portion at at least one end of the housing is provided with a plurality of first spoke mounting holes arranged in the circumference of the housing, and the metal cover provided inside the mounting portion of the housing is a third metal cover, and the third metal cover is provided with fourth spoke mounting holes in the circumference corresponding to the first spoke mounting holes. The spoke includes a spoke rod and a snap-fit ​​end located at the end of the spoke rod. The spoke rod passes outward from the cavity inside the housing in sequence through the fourth spoke mounting hole and the first spoke mounting hole, so that the snap-fit ​​end is snapped into the inside of the fourth spoke mounting hole.

10. The connection structure between the hub and spokes as described in claim 9, characterized in that: The diameter of one end of the mounting portion of the housing is larger than the diameter of the middle portion; the first spoke mounting hole and the fourth spoke mounting hole are in the shape of a circular main hole and a straight hole extending from one side of the circular main hole, and the width of the straight hole is smaller than the diameter of the circular main hole.

11. The connection structure between the hub and the spokes as described in claim 10, characterized in that: The housing is provided with the mounting part at only one end, and the other end of the housing extends outward to form a number of blades. Each blade is provided with a second spoke mounting hole and a third spoke mounting hole. The spokes consist of two sets. The first set of spokes passes through the second spoke mounting hole and is installed by rotating clockwise. The second set of spokes passes through the third spoke mounting hole and is installed by rotating counterclockwise, so that the first set of spokes and the second set of spokes form a cross-woven structure.

12. A manufacturing process for a flower drum, characterized in that: A hub as described in any one of claims 1-4 is produced by the following method: S1. Form two sets of metal cover blanks, one end of which has the groove on its outer wall; form an annular silicone sleeve that fits into the inner cavity of the hub shell. S2. Install two sets of metal cap blanks at both ends of the silicone sleeve, and wrap multiple layers of carbon fiber yarn around the silicone sleeve and the metal cap, so that part of the carbon fiber yarn covers the groove of the metal cap to form a carbon fiber covered part; S3. Place the carbon fiber coated part obtained in step S2 into the drum shell preparation mold, and apply pressure and heat to solidify the carbon fiber yarn; S4. Open the mold, remove the carbon fiber covering, and remove the silicone sleeve inside; S5. Machining the metal cap blanks at both ends to form the corresponding shape and size, thus obtaining the required metal cap; S6. Assemble the pivot rotation assembly to form the hub.

13. The manufacturing process of a flower drum as described in claim 12, characterized in that: In step S1, the expansion coefficient of the silicone sleeve is 1.2~1.3; in step S3, after the carbon fiber covering is placed in the hub shell preparation mold, the mold closing pressure set in the hub shell preparation mold is 55t~65t, the temperature is 155℃~165℃, and the curing time is 50~80min.

14. The manufacturing process of a flower drum as described in claim 12, characterized in that: The hub shell preparation mold includes: a base, a cover, and a mold core assembly, a slider assembly, and a mold core assembly installed in the cavity formed by the base and the cover; The mold core assembly includes an upper mold core and a lower mold core, and the inner walls of the upper mold core and the lower mold core are provided with mold core cavities that are adapted to the shape of the outer wall of the drum shell; The core assembly is used to fit the carbon fiber covering and is located in the middle of the cavity; The slider assembly is formed by a plurality of sliders, and the inner side of the slider is provided with a slider cavity that is adapted to the shape of the outer wall of the hub shell; the slider assembly is disposed between the upper mold core and the lower mold core and surrounds the periphery of the carbon fiber covering.

15. The manufacturing process of a flower drum as described in claim 14, characterized in that: The mold core assembly includes a mold core and a mold core base. The center of the base is provided with an upwardly protruding multi-layered boss. The center of the mold core base is hollowed out. The mold core assembly is fixed by fitting the mold core base onto the boss. Both the upper and lower mold cores are composed of several mold core blocks, and the mold core blocks correspond to the slider.

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